JPH01276548A - Image display device - Google Patents

Abstract

PURPOSE:To shorten the image display time by arranging multiple electron beam emitting sections in a vacuum envelope and individually and concurrently controlling the emission quantity of electron beams with electron beam emission controllers corresponding to individual electron beam emitting sections. CONSTITUTION:Multiple electron beam emitting sections 4 are formed on the inside of a vacuum envelope 3, individual electron beam emission controllers 8 are provided for the electron beam emitting sections 4 respectively and independently and concurrently control individual electron beam emitting sections 4. The synchronization of individual electron beam emission controllers 8A, 8B,...,8M, a horizontal scan driving section 10 and a vertical scan driving section 11 is controlled by a synchronization signal generator 12 to synchronize the image display. Individual display zones are independently and concurrently controlled and displayed, thus the scanning time can be made shorter than the time when electron beams are scanned in sequence and displayed on one screen.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat image display device used in color television receivers, computer terminal displays, and the like.

BACKGROUND OF THE INVENTION Conventionally, flat panel image display devices have been proposed as disclosed in Japanese Patent Application No. 103501/1983 filed earlier by the present applicant, or in Japan Display '86 P512, published in 1986. There are things that are. The structure of the former flat-plate image display device is shown in FIG. 4, and its control system is shown in FIG. The latter structure is shown in FIG. Hereinafter, it will be explained in detail using the drawings.

As shown in FIG. 4, in the former case, linear cathodes 101 are vertically stretched at equal pitches in the horizontal direction, and horizontally long electrodes (vertical scanning electrodes) 102 are placed on the back side at equal pitches in the vertical direction. The number of lines is half the number of scanning lines. The generation of electrons from the linear cathode 101 is controlled by the voltage applied to the vertical scanning electrode 102. Control electrodes (G1 electrode 103, G2 electrode 104, Ga [pole 105 at the head) for controlling the electron beam amount are placed on the opposite side of the vertical scanning electrode 102 across the filamentary cathode 101, keeping a predetermined interval. It is provided. Each of these electrodes is provided with an opening of a predetermined size at a position corresponding to the vertical scanning electrode 102. Next, in order to vertically focus the electron beam, a DV1 electrode 106, a DV2 electrode 108, which deflects the electron beam in the vertical direction, are arranged. Here, DVl [pole 106, D
V2 N pole 107 (7) Opening) 1 Gl -Ga[
The poles (7) are shifted in opposite directions perpendicularly to each other from the aperture center axis, and the DVI is connected to the pole 106 and the DV2 electrode 107 (
7) The electron beam is deflected in the vertical direction by varying the voltages applied to each. For horizontal focus, the DH1 electrode, which is a horizontal focus and horizontal deflection electrode placed next to the shield electrode 108, is used as the pole 109, and the DH2 electrode '11
0, DH3 electrode 111. That is, DHI electrode 109, DH2 electrode 110, D) (different voltages are applied to the three electrodes 111, DHI - DH2, DH
The electron beam is focused in the horizontal direction by an electrostatic lens formed between 2-DH3. In addition, the DH electrode 109
, DH2 electrode 110, and DH3 electrode 111 are superimposed with a common sawtooth wave voltage and deflected in large numbers to improve deflection sensitivity. The anode surface 112 is red (R), green (
G), blue (B) striped phosphors 113 are sequentially and repeatedly arranged in the horizontal direction via black stripes 114, and a metal back electrode 115 is formed thereon.

The operation of the flat image display device described above will be explained. Beam extraction from the linear cathode 101 and beam modulation using a video signal are the same as those for normal TV displays.
Vertical scanning by 02 is added. That is, the vertical scanning electrode 1 is arranged so that the potential of the space surrounding the linear cathode 101 is more positive or negative than the potential of the linear cathode 101.
By controlling the voltage of 02, the linear cathode 101
The generation of the electron beam from the is controlled. Therefore, from the top to the top of the vertical scanning electrode 102, one horizontal scanning period (hereinafter I
Only in H), vertical scanning can be performed by applying a voltage that generates a beam from the cathode portion corresponding to each vertical scanning electrode 102. At this time, 1
Vertical scanning period (hereinafter referred to as IV), DVI ti 106, D
V2m [107] The pressure is constant at the T1 electrode 106, and when entering the next 12, the beam reaches the fluorescent surface by a predetermined distance in the vertical direction.
, DV21 is deflected to the pole 107 to perform an interlace operation.

The video signal is applied to the linear cathode 101, and the modulated electron beam passes through a vertical and horizontal focusing system, is horizontally deflected, and enters the fluorescent surface. The correspondence with the color phosphors on which the beam is incident will be explained with reference to FIG.

The flat panel image display device 201 is provided with an index signal generating section 203 having the same electrode configuration as one horizontal block of the image display section outside the image display section 202. This part has R,,
Equivalent to or twice the repetition pitch of G and B color phosphors
The index phosphor is applied through black stripes at a pitch of /3. The index phosphor may be the same as the B phosphor of the image display section, but
An index signal with a better S/N ratio can be obtained by using a P-47 phosphor or the like having a shorter wavelength.

The index signal generating section 203 is constantly scanned by a beam, and the light generated there is transferred to the photoelectric conversion element 20.
4 and obtains the index signal 220 as a reference signal. On the other hand, the image display unit 202 generates a certain DC beam for each horizontal block individually to scan the fluorescent surface,
The photoelectric conversion element 230 receives the B light through the blue filter 205 so as to detect only the B light from the phosphor surface, and a timing signal 221 for the electron beam to enter the B phosphor is obtained.
This timing signal 221 is stored in the form of a time difference with the index signal 220. That is, as shown in FIG. 5, the time from the rise of the index signal 220 to the rise of the B timing signal 221 is 11, t2.
... is measured by the measurement circuit 206, and this is measured by the memory circuit 20.
7 in memory. In this way, the timing of incidence on the B phosphor for all the beams of each horizontal block is memorized. As a result of the above, the flat image display device 201
The timing of each unique beam's incidence on the B phosphor during horizontal deflection is memorized.

When displaying an image next time, by reading out the stored signal based on the index signal 220, each beam is
A timing signal 222 that enters the phosphor is obtained, and by creating signals 223 and 224 whose phases differ by 120 from each other, a timing signal that enters the JG phosphor can be obtained.

The color video signals ER, Ec, and EB demodulated into JG and B by these signals are sent to gate circuits 208 and 2.
08G1208B and add it in the adder 209 to obtain a point sequential signal, which is then sent to the amplifier 2.
When the electron beam is amplified by 10 and modulated by this (2),
By sequentially scanning the corresponding color phosphors, a faithful color image can be reproduced.

Next, the case shown in FIG. 6 will be explained. Here, 301 is a front panel, 302 is a light emitting part, 303 is a back panel, 304 is a cathode electrode part, 305 is a gate electrode part, 306 is an insulating layer, 307 is an electron beam emitting part, and 308 is a hollow part. In this planar shadow image display device, a plurality of strip-shaped cathode electrode sections 304 are formed on a back panel 303, an insulating layer 306 with a thickness of 1.5 μm is formed on the insulating layer 306, and a plurality of strip-shaped cathode electrode sections 304 are disposed on the insulating layer 306, which are perpendicular to the strip-shaped cathode electrode sections 304. A plurality of band-shaped gate electrode portions 30
5 is formed. Furthermore, in the area where the cathode electrode part 304 and the gate electrode part intersect, a diameter of 1.2 to 1.4 μm is added.
A hollow part 308 with an opening diameter of 1 is provided, and a conical electron beam emitting part 307 electrically connected to the cathode electrode part 304 is formed in the hollow part 308 at a density of 104 to 10/M. A front panel 301 having a light emitting section 302 formed inside is arranged opposite to these.

Next, this operating method will be described. Electron beam emitter 307
When a predetermined voltage is applied between the cathode electrode section 304 and the gate electrode section 305, electrons are emitted, collide with the opposing light emitting section 302, and emit light. That is, by sequentially applying a voltage between the plurality of strip-shaped cathode electrodes 304 and the plurality of strip-shaped gate electrodes 305, an electron beam is emitted from the electron beam emitting part 307 at the intersection of the two strip-shaped electrodes to which the voltage is applied, and The image display was performed by sequentially causing the light emitting units 302 to emit light.

Problems to be Solved by the Invention However, in conventional flat-panel image display devices, one screen was formed by controlling electron beams and scanning horizontally and vertically in time sequence. Even when changing the image, it is necessary to scan the electron beam for one screen, and there is a lot of wasted time in displaying the image, which poses a problem in terms of speeding up the image display. The present invention solves the above problems. The object of the present invention is to provide an image display device that shortens the image display time, divides the display screen, and controls the divided screens independently and simultaneously to display images. It is.

Means for Solving the Problems In order to achieve the above object, the technical solution of the present invention is as follows:
First, a plurality of electron beam emitting sections are arranged at predetermined intervals in a vacuum envelope, a light emitting section made of at least a phosphor is provided opposite to the electron beam emitting sections, and the electron beam emitting section and the light emitting section are connected to each other. A focusing electrode section for focusing the electron beam in the space between them, and a horizontal deflection section and a vertical deflection section for scanning the electron beam horizontally and vertically are provided, and an electron beam corresponding to each electron beam emission section is provided. The emission control section individually and simultaneously controls the amount of electron beams emitted from each electron beam emitting section, causes different areas of the light emitting section to emit light individually and simultaneously, and displays a single composite image. Second, the image display screen was divided into N parts, and N sets of electron beam emission parts and electron beam emission control parts were provided corresponding to each part, and images were displayed on each of the N divided screens independently and simultaneously. It is something.

According to the above configuration, the present invention controls the emission and scanning of the electron beam from the electron beam emitting section independently and simultaneously using the plurality of electron beam emitting control sections, thereby controlling the corresponding divided light emitting section areas. In order to emit light, the time for displaying the entire screen is the time for each electron beam emitting section to scan the corresponding divided light emitting section area with the electron beam. Therefore, compared to the conventional time required to display one screen, that is, the time required to scan one screen with an electron beam, in the present invention, the time required to display one screen is reduced to the time required to scan a small screen. The time can be shortened. That is, according to the present invention, it is possible to speed up image display, and since the screen can be divided into multiple parts, it is possible to display different image information independently and simultaneously on the divided screens.

Example The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of a flat panel image display device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of the main components in a vertical section of FIG. 1. In the figure, the same parts are indicated by the same numbers, 1 and 3 are the vacuum envelope, 2 is the light emitting part, 4, 4A, 4B,
..., 4M is an electron beam emission part, 5 is a concentrated electrode part,
6 is a horizontal deflection section, 7 is a vertical deflection section, 8, 8A, 8B, .
..., 8M is the electron beam emission control section, 9, ga,
gb, gc are electron beams, 10 is a horizontal scanning drive unit, 11
12 is a vertical scanning drive unit, 12 is a synchronization signal generation unit, 13A,
13B, . . . , 13M indicate display zones. First, the configuration of the present invention will be explained. A light emitting section 2 made of a phosphor is formed inside a vacuum envelope 1 made of glass,
A plurality of electron beam emitting sections 4 for emitting electron beams are formed inside the vacuum envelope 3 facing this. Each electron beam emitting section 4 is provided with an individual electron beam emitting control section 8, so that each electron beam emitting section 4 can be controlled independently and simultaneously. In addition, in the space between the vacuum envelopes 1 and 3, a focusing electrode part 4 for focusing the electron beam, which is electrically divided and arranged in parallel at a predetermined interval,
A horizontal deflection electrode section 6 and a vertical deflection electrode section 7 are provided for deflecting and scanning the electron beam.

Next, the operating method of the present invention will be explained. An electron beam emission control section 8 applies a predetermined voltage to an electron beam emission section 4 formed inside a vacuum envelope 3 made of glass, such as a tunnel cathode made of Cs-AE20s-Au, to extract an electron beam. . Thereafter, the electron beam is focused by the focusing electrode section 5, and then a predetermined voltage is applied to the horizontal deflection section 6 and the vertical deflection section 7 to deflect and scan the electron beam in the horizontal-vertical direction. Then, by horizontally and vertically scanning the light emitting part 2 with an electron beam, the phosphor of the light emitting part 2 is emitted, and an image is displayed. This light emitting part 2 has a transparent electrode inside the vacuum envelope 1,
For example, ITO may be formed and a phosphor may be formed thereon, or a metal back layer may be provided for the purpose of improving luminance. Also, if you want to display in color, red,
Three color phosphors that emit green and blue light may be formed in stripes at a predetermined pitch. The present invention further includes the following characteristic operating functions. This point will be explained using FIG.

FIG. 2 is a schematic vertical cross-sectional view of the main components of the flat panel image display device according to the embodiment of the present invention shown in FIG. The following will explain the vertical direction, but the same applies to the horizontal direction. The electron beam 9 emitted from the electron beam emission section 4A controlled by the electron beam emission control section 8A is focused by the focusing electrode 5, and then subjected to deflection scanning in the horizontal direction by the horizontal scanning drive section 10 in the horizontal deflection section 6. Then, in the vertical deflection section 7, the light is deflected and scanned in the vertical direction by the vertical scanning drive section 11, and enters the light emitting section 2, causing a predetermined area of the light emitting section 2, that is, the display zone 13A, to emit light to display an image. Is going. In this deflection scanning, the trajectory of the electron beam when it is not deflected in the vertical direction is 9b, but when it is deflected in the vertical direction, the upper limit is 9a and the lower limit is 90, which is displayed on the light emitting unit 2. An image of the area of zone 13A is displayed. The position of the display zone 13A displayed by the lower limit locus 9C of the electron beam 9 corresponds to the display position immediately above the upper limit display portion of the display zone 13B below it, and the display zone 13A is located at the display position immediately above the upper limit display portion of the display zone 13B below, and the display zone 13A is located at the display position immediately above the upper limit display portion of the display zone 13B below. Care has been taken to avoid any inconvenience in image display. Similar consideration is given to the display zone 13M displayed by the electron beam emitting section 4M, and the same consideration is given to the boundary portions in the horizontal direction as well. In order to synchronize the image display of the entire flat panel image display device, the synchronization signal generating section 12 controls each of the electron beam emission control sections 8A, 8B, . . . , 8M1 horizontal scanning drive section 10 and vertical scanning drive section. It controls the synchronization of 11. As shown above, each display zone is independently and simultaneously controlled and displayed by an independent electron beam emitting unit, so the scanning time is 1.5 times longer than the time it takes to display one screen by sequentially scanning the electron beam. / (number of split display zones). In fact, using microfabrication technology, a 50mm
An array of tunnel cathodes having a range of 0.00 mm and an interval of 1 mm was formed, and a predetermined electrode plate was also fabricated to fabricate a flat plate image display device. Each cathode was provided with an electron beam emission control section that stored the electron beam emission amount and was equipped with an electron beam emission amount correction section so that each cathode had a uniform emission amount. Using this electron beam emission control section, the l mi' light emitting section was scanned, and an image display device with a performance of 5 pixels/- was fabricated. In addition, the amount of current emitted from the cathode is 2μA/mm
Because the scanning speed of the electron beam is slightly smaller than that of the normal TV
Although the speed was slower than the scanning speed, the display time for one screen could be reduced to about 1/3.

A second embodiment of the present invention will be described below with reference to FIG. 21 is a light emitting part, 22 is an electron beam emitting part, 2
3 is an electron beam emission control section, 24 is a coupling line, Pij is a display zone, Kij is each electron beam emission section, and Cij is each electron beam emission control section. The light emitting section 21 is divided into mxn display zones, and mxn pairs of electron beam emitting sections and electron beam emission control sections are provided corresponding to each display zone, and they are connected to each other by a connecting line 24, so that, for example, the display zone By controlling the electron beam emission section Ki by the electron beam emission control section C1J corresponding to PiJ, light emitting display can be performed. Since each electron beam emission control section controls the corresponding electron beam emission sections independently and simultaneously to display images, the electron beam of the corresponding display zone is By directly sending a change signal only to the release control unit, it is not necessary to scan one screen of electron beams as in conventional image display devices, and the image display time can be significantly shortened. That is, the display method of the present invention makes it possible to increase the speed of image display and to control many display screens independently and simultaneously, thereby greatly improving the image display function.

Effects of the Invention As described above, the present invention can greatly speed up image display, and also allows many screens to be displayed independently and simultaneously within one image display device. It is possible to significantly improve functionality.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a flat panel image display device according to a first embodiment of the present invention, FIG. 2 is a schematic diagram of the main components in a vertical section of FIG. 1, and FIG. 3 is a diagram of a second embodiment of the present invention. 4 is a perspective view of a conventional flat panel image display device, FIG. 5 is a circuit diagram showing a control system of the flat panel image display device of FIG. 4, and FIG. 6 is a conventional flat panel image display device. FIG. 3 is a partially cutaway perspective view showing the configuration of another example of a flat plate image display device. 1.3... Vacuum envelope, 2,21... Light emitting section, 4゜22... Electron beam emitting section, 5... Focusing electrode section, 6...
- Horizontal deflection section, 7... Vertical deflection section, 8, 23... Electron beam emission control section, 9... Electron beam. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3 Figure 6 JLJ /

Claims (3)

[Claims] (1) A plurality of electron beam emitters arranged at predetermined intervals in a vacuum envelope, the electron beam emitters are located at opposing positions with a space in between, and at least a light emitting part made of a phosphor; A focusing electrode part that is located in the space between the electron beam emitting part and the light emitting part and focuses the electron beam, a horizontal deflection part and a vertical deflection part to horizontally scan and vertically scan the electron beam, and each electron beam. It is characterized by having an electron beam emission control section corresponding to the emission section, and individually and simultaneously controlling the amount of electron beam emitted from each electron beam emission section to individually and simultaneously cause different areas of the light emission section to emit light. image display device. (2) The image display according to claim 1, wherein the electron beam emission control section includes an electron beam emission amount correction section for making uniform the amount of electron beam emission from the plurality of electron beam emission sections. Device. (3) Divide the image display screen into N parts, and divide the image display screen into N parts.
1. An image display device comprising a set of an electron beam emission section and an electron beam emission control section, each of which displays N divided screens independently and simultaneously.